Radeon HD 4830 detailed further, launch dated

Seems like Radeon HD 4830 will have 640 stream processors instead of the 480 as we learned previously. It comes with 256-bit memory interface with 512MB GDDR3 memories. Since AIB partners are free to design their own cards therefore we should be seeing different card solutions with different clocks and memory sizes/types from each makers. The launch for Radeon HD 4830 is set at October 21st and it is targeted primarily at Nvidia GeForce 9800 GT with a less than US$150 price tag.